Also, at the beginning of your end step you can sacrifice a Zombie to draw a card, so you can sacrifice your Zombie token with decayed you made to draw a card
If the creature becomes a 4/4 Shark and then the cracks become completely covered later in the turn, the creature won't spontaneously become an 8/8 Octopus
Linden is a great source of steady efficient lifegain, which is great for Lifegain decks to fuel powerhouses such as Well of Lost Dreams, Serra Ascendant, and Ajani, Strength of the Pride
Drawing cards, making copies of artifacts or creatures, and clearing the board are all great options
But while it hits each opponent, it also hits you as well